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Aldrich Boilers – DG Series

Capacities: 4 – 42 BHP
Inputs from 144,000 to 1,750,000 BTUH
Outputs from 115,000 to 1,400,000 BTUH
80 – 83% Efficiency


Aldrich Company manufactures three pass and vertical firetube steam boilers for low pressure applications. The Classic Series modified Scotch Marine “Scotch Box” boiler is designed to fit through a standard doorway.

  • D = Oil Fired | DG = Gas Fired
  • Vertical Firetube Boiler
  • 15 PSI Steam / 30 PSI Water Design
  • All Steel Construction
  • Engineered with Water Surrounded Furnace
  • Optional Heat Exchanger (Tankless Coil) For Indirect Loads
  • Insulated Boiler with 18 Gauge Boiler Jacket


The “D & DG” include a low stress thermal shock resistant single pass vertical design. With thousands of boilers installed worldwide this has proven to be a robust boiler design.

Primary flue gases pass via water backed heat transfer tubes. No refractory backed finned passages to burn out.

Large Steam Chamber with internal water separator insures high quality dry steam.

The “D & DG” Series may be factory constructed with an integral copper finned heat exchanger allowing the boiler the ability to provide both direct heating and indirect heating.

The Forte of Aldrich Company has always been to only manufacture products of the highest quality and design, by using the finest materials available and employing loyal craftsman with the skills and aptitude necessary towards this end. The outsource no sub-assemblies and they procure only domestic steel and tubing to fabricate their pressure vessels. All Aldrich boilers and water heaters are constructed and stamped to Section IV of the ASME code and registered with the National Board of Pressure Vessel Inspectors.


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